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Leases and Other Finance Obligations - Summary of Future Maturities of Lease Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating Leases
2021 (from October 1, 2021)	$ 29,490
2022	112,718
2023	95,739
2024	78,513
2025	56,062
Thereafter	167,888
Total lease payments	540,410
Less: amount representing interest	(85,488)
Present value of lease liabilities	454,922
Less: current portion	(94,651)	$ (61,625)
Long-term lease liabilities, net of current portion	360,271	219,239
Finance Leases
2021 (from October 1, 2021)	409
2022	1,570
2023	1,337
2024	480
2025	257
Thereafter	438
Total lease payments	4,491
Less: amount representing interest	(338)
Present value of lease liabilities	4,153
Less: current portion	(1,444)	(12,178)
Long-term lease liabilities, net of current portion	$ 2,709	$ 11,695

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